The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 15, 1992
Filed:
Oct. 08, 1991
Werner Sondergeld, Offenbach am Main, DE;
Gerhard Hackelborger, Offenbach am Main, DE;
MAN Roland Druckmaschinen AG, , DE;
Abstract
A process for the production of a surface structure on a printing cylinder for offset printing presses, wherein said cylinder includes a galvanically coated hard chrome surface, comprising applying a thin layer of alkali-resistant negative-resist material to said hard chrome surface, contacting the resist material with a positive raster, irradiating said cylinder to harden a portion of the resist material, removing the unirradiated resist material, and etching said hard chrome surface by forming a circuit with said printing cylinder as the anode, contacting said hard chrome surface with a sodium hydroxide solution which has passed through a cathode, and removing the hardened resist material from said printing cylinder.